Yes, multiple things can affect rental supply, not just government price controls.

It’s inevitable that any type of price control will lead to supply/demand issues. That’s great it worked out for you but it is well documented that rent control harms rental markets long term. Anyone who disagrees is in denial.

Yes, rent control, our panacea.

Negative Effects on Supply: Rent control can potentially lead to housing shortages over the long term. When landlords are unable to raise rents to cover maintenance and operating costs or to generate a reasonable return on their investment, they may have less incentive to maintain or invest in their properties. This can lead to a deterioration in the quality of rental housing and a reduction in the overall supply of rental units. In some cases, landlords may convert rental properties into other uses, such as condominiums or commercial spaces, further reducing the supply of rental housing.

Inefficiencies and Reduced Mobility: Rent control can lead to inefficiencies in the housing market. Tenants in rent-controlled units may have less incentive to move, even if their housing needs change, because they want to keep their low rents. This reduced mobility can make it harder for new renters to find suitable housing.

Selective Impact: Rent control often applies to older buildings or units built before a certain date. This can create disparities in rent levels between newer and older housing stock, potentially discouraging the construction of new rental units and leading to further imbalances in the housing market.

A short term band-aid that causes long term problems. Government price controls are a tale as old as time.